gmc 4-1 manifold and procomp filter

11th May 2007, 00:57

Is the gmc 4-1 manilfold the best to get for my westcoast performance wise? its not a bad price at £180 as a supersprint is £250!

11th May 2007, 01:03

Where can you get a gmc 4-1 for £180?

11th May 2007, 01:40

think its GMC but on there site they havent added VAT

so expect to pay a bit more unless your buying it elsewere

id say 4-1 are better for higher up the rev range and 4-2-1 are good for lower down

11th May 2007, 01:48

Hes right ^^

4-1 higher up 4-2-1 lower down.

Also add on postage if its from gmc.

11th May 2007, 07:03

also procompe arent made now

11th May 2007, 07:40

For smaller engined cars and the 8v 1600 Id reckomend going 4-2-1 rather than 4-1 as the 4-2-1 offers more low to mid range gains which is better for the 8v's.

Where as the 4-1 is more cut out for mid to high end gains, so is more at home on the more rev happy 16v.

But either will show a gain over the standard Citroen item.

As Bullit mentioned ProComp stopped trading a while back and although their items are still floating around the demarnd silly money. Look to RaceLand scoops from www.kam-racing.com or the more expensive Green item.

Only difference really was that the ProComp was made of Real Carbon Fiber and was twice the size of the RaceLand and Green item.

11th May 2007, 11:42

pro comp no longer exisit BUT streamline carbon have the moulds and still make alot of the procomp stuff

11th May 2007, 11:45

Get a 4-1 if you want high end gains.. regardless whether its 8v or 16v, at the end of the day 8v's produce their power high up just like a 16v..

11th May 2007, 11:45

Quote:

Originally Posted by Itsafastworld85

pro comp no longer exisit BUT streamline carbon have the moulds and still make alot of the procomp stuff

Do know if they are able to sell items online?

inother words, do they have a website?

11th May 2007, 11:55

http://search.ebay.co.uk/search/sear...bon&category0=

thats all the streamline stuff on ebay, wish i had the cash for carbon goodies!

11th May 2007, 12:03

Im liking this.

http://cgi.ebay.co.uk/SAXO-STREAMLIN...QQcmdZViewItem

Thats got to be a 16v cover aint it! Surely that cant replace the two metal items can it?

Is that simply a cover to go over the top of the metal rocker covers?

11th May 2007, 12:11

Quote:

Originally Posted by VTS_16v_Boy

Im liking this.

http://cgi.ebay.co.uk/SAXO-STREAMLIN...QQcmdZViewItem

Thats got to be a 16v cover aint it! Surely that cant replace the two metal items can it?

Is that simply a cover to go over the top of the metal rocker covers?

yes it meerly sits over the metal cam covers. kept in place by the oil cap

11th May 2007, 13:17

Quote:

Originally Posted by James_Bristol

Get a 4-1 if you want high end gains.. regardless whether its 8v or 16v, at the end of the day 8v's produce their power high up just like a 16v..

consider the usable power band also. While making the car have a higher narrower powerband make a pro driver faster.. most people will benifit more from more midrange.

11th May 2007, 13:45

yeah for everyday driving you will want a 4-2-1..

But if all your car does is track days and it gets held up in the high revs for long periods of time then the 4-1 is the way to go..

11th May 2007, 13:46

GMC dont do a 4-1 stainless steel manifold for the VTS/GTi do they? I think
I may just go supersprint tbh.

11th May 2007, 13:47

id say 4-1 for quarter miles but its a bit of a decision and track days might be only on a long straight your gonna need a 4-1 but on twisty corners then its going to be a 4-2-1

11th May 2007, 13:51

4-2-1 if pottering around, lets face the facts if wanting to get performance manifold take it you will be giving it some booty up the rev range so mayswel get 4-1!

11th May 2007, 16:30

I have a repaired supersprint 8v manifold in the garage, I've PM'd you about it

4-2-1, two piece styled version.

I'd definately go 4-2-1 with 8v 1.4 on standard cams!

The GMC 4-1 16v new BTB m/s manifold is £195 + VAT + Delivery

11th May 2007, 16:34

Quote:

Originally Posted by Steve_VTR

4-2-1 if pottering around, lets face the facts if wanting to get performance manifold take it you will be giving it some booty up the rev range so mayswel get 4-1!

if it was being used on track yes, but to be honest the cars we have tend to be driven hard for fun round the local A and B roads which tend to be tighter and benefit more from a wider powerband.

11th May 2007, 19:40

josh what are you using with your tbs?

11th May 2007, 21:24

it wont be on a standard cam tho im looking into buying a catcam instead of piper....

11th May 2007, 21:26

id go 4-1.

also with your cam youve just got to compare profiles to see which is best. newmans are worth looking at to

11th May 2007, 22:00

Quote:

Originally Posted by James_Bristol

yeah for everyday driving you will want a 4-2-1..

But if all your car does is track days and it gets held up in the high revs for long periods of time then the 4-1 is the way to go..

depends on the track, if your like most uk tracks which are short and twisty you need to have good midrange because of the short tight bends and not 3mile straights.

4-2-1s offer a better power curve which is less stepped. even the MAXI manfiold on bics and ians run a 4-2-1 configuration

11th May 2007, 22:03

quarter mile?

11th May 2007, 22:03

Quote:

Originally Posted by bullit

josh what are you using with your tbs?

new type btb manfiold with larger collection box and modified btb exhaust irc

11th May 2007, 22:04

Quote:

Originally Posted by bullit

quarter mile?

even then id personally have a wider power band personally, due to the fact most saxos barely get over 90mph on a 1/4

11th May 2007, 22:18

what would be the actual power bands though for each?

11th May 2007, 22:38

Quote:

Originally Posted by bullit

what would be the actual power bands though for each?

depends on the cam profile again.

ill try and find davePs rolling road graphs on tbs 708s in an s1 rallye.

one was with the gmc 4-1 ans another the raceland 4-2-1 the results are very interesting to read.

its why im running a 4-2-1 myself.

11th May 2007, 23:00

Dave P got gains throughout the rev range with the Raceland. An impressive set of results

11th May 2007, 23:02

good man

say standard cams then?

so having a 4-2-1 over 4-1 could be better whether your running standard cam or aftermarket? ive asked bic about an hour a go to see what he was running, you say 4-2-1 which is interesting.

12th May 2007, 11:05

GMC it s the same quality than raceland or it s like supersprint ?

12th May 2007, 12:06

Quote:

Originally Posted by benjisrd

GMC it s the same quality than raceland or it s like supersprint ?

gmc is mild steel so will rust, however the grade of mild steel is alot better than the raceland which is very thin and doesnt have great welding. supersprint is a higher grade 4-2-1 set up with better welds and metals used

12th May 2007, 12:08

Quote:

Originally Posted by KamRacing

if it was being used on track yes, but to be honest the cars we have tend to be driven hard for fun round the local A and B roads which tend to be tighter and benefit more from a wider powerband.

i see your point

But if the 4-2-1 is a shite design could loose power? was reading it on the gmc site...... not sure if a load of balls or what. Personally i noticed no difference with my manifold, car revs a bit more freeley thats it......

btw thats a stainless steel gmc 4-1

12th May 2007, 12:25

Quote:

Originally Posted by Steve_VTR

i see your point

But if the 4-2-1 is a shite design could loose power? was reading it on the gmc site...... not sure if a load of balls or what. Personally i noticed no difference with my manifold, car revs a bit more freeley thats it......

btw thats a stainless steel gmc 4-1

gmc website is A out of date and B if you notice all the information points to their products being the best, same as any other companies website so dont read it like a bible

as ive said a 4-2-1 on a rolling road was proven to have good gains

13th May 2007, 10:45

Quote:

Originally Posted by bullit

josh what are you using with your tbs?

Do you mena manifold wise?

Just got one of the first new designed GMC BTB 4-1 m/s ones mate

If you mean cams im on 708s. Cars nearly done now, im sure you'll see me around

13th May 2007, 10:48

Quote:

Originally Posted by Itsafastworld85

new type btb manfiold with larger collection box and modified btb exhaust irc

Thanks Ryan

I'd say go for the 8v 4-2-1 SS supersprint i have sitting in the garage

13th May 2007, 12:24

aye meant fanny. was gonna ask if yours is nearly there